Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

How is SOC or range calculated?

spaceballs

Member
Sep 17, 2013
633
106
Sammamish
Does anyone know how SOC or range is calculated on the Roadster? My fake sheet (bricks 46-54) has confused the roadster to drop it's range to 17 miles.

Voltage SOC Brick
3.91 84.11 1
3.89 82.27 2
3.91 85.15 3
3.93 89.25 4
3.93 90.02 5
3.94 90.74 6
3.94 91.23 7
3.94 91.53 8
3.95 92.47 9
3.90 83.08 10
3.89 81.28 11
3.90 84.30 12
3.92 88.24 13
3.93 89.77 14
3.94 90.23 15
3.94 90.73 16
3.94 91.54 17
3.95 91.98 18
3.90 84.30 19
3.89 81.28 20
3.91 85.15 21
3.93 89.25 22
3.93 89.77 23
3.94 90.74 24
3.94 90.73 25
3.94 91.52 26
3.95 92.19 27
3.90 84.11 28
3.89 82.27 29
3.90 84.11 30
3.93 89.25 31
3.94 90.55 32
3.94 90.84 33
3.94 91.53 34
3.94 91.76 35
3.95 92.76 36
3.90 83.90 37
3.90 83.30 38
3.91 85.15 39
3.93 89.25 40
3.93 89.84 41
3.94 90.55 42
3.94 91.23 43
3.94 91.77 44
3.95 92.48 45
3.82 30.74 46
3.81 22.61 47
3.75 28.75 48
3.82 28.83 49
3.74 25.58 50
3.80 45.06 51
3.77 47.77 52
3.78 51.28 53
3.81 66.87 54
3.90 84.11 55
3.90 83.30 56
3.91 85.15 57
3.93 89.25 58
3.93 90.23 59
3.94 90.73 60
3.94 91.23 61
3.94 91.53 62
3.95 92.47 63
3.89 82.27 64
3.89 80.33 65
3.90 83.08 66
3.92 88.24 67
3.93 89.76 68
3.93 90.23 69
3.94 90.51 70
3.94 91.23 71
3.94 91.76 72
3.90 84.11 73
3.90 84.30 74
3.92 87.23 75
3.93 89.25 76
3.94 90.23 77
3.94 90.84 78
3.94 91.54 79
3.95 92.47 80
3.95 92.98 81
3.91 84.11 82
3.90 82.27 83
3.91 85.15 84
3.93 89.03 85
3.94 90.55 86
3.94 90.84 87
3.94 91.23 88
3.94 91.77 89
3.95 92.47 90
3.91 86.20 91
3.90 84.11 92
3.92 87.23 93
3.93 89.80 94
3.94 90.55 95
3.94 91.23 96
3.94 91.56 97
3.94 91.77 98
3.95 92.49 99
 

marco2228

Roadster Signature #34
Nov 19, 2010
211
55
Cologne/Bremen , Germany
3.81 22.61 47

17 miles in standard or range; ideal or rated?

Standard could make sense. Range has to be calculated from the brick with the lowest amount of left energy.

This is what I believe:
SOC range in standard mode: 10 - 100 % SOC (not sure about the 10%)
SOC range in range mode: 0 - 110 % SOC

Your lowest brick has a SOC of 22% which is 12 % in standard mode.
That would be 141 miles (rated?) for 100 % SOC.

- - - Updated - - -

3.81 22.61 47
3.75 28.75 48

That's strange. Brick #47 has a higher voltage but lower SOC...

So the SOC seems not to be calculated from the voltage only.
 

spaceballs

Member
Sep 17, 2013
633
106
Sammamish
17 miles in standard or range; ideal or rated?

Standard could make sense. Range has to be calculated from the brick with the lowest amount of left energy.

This is what I believe:
SOC range in standard mode: 10 - 100 % SOC (not sure about the 10%)
SOC range in range mode: 0 - 110 % SOC

Your lowest brick has a SOC of 22% which is 12 % in standard mode.
That would be 141 miles (rated?) for 100 % SOC.

- - - Updated - - -



That's strange. Brick #47 has a higher voltage but lower SOC...

So the SOC seems not to be calculated from the voltage only.

Thanks Marco.

It was in standard mode.

Before the mileage drop, I said I had 144 mile range, I think I need to do more playing on the fake sheet and gather more data.
 

spaceballs

Member
Sep 17, 2013
633
106
Sammamish
I noticed the lowest brick as I bring up the voltage on it, that range start to rise, seem like a direct correlation but I assume some SOC is factored in it.

Sigh, I accidentally burnt out resistor R73 on the dc-dc converter... hopefully this will be an easy fix.

Edit: BMB fixed, in case anyone cares, R73 is likely a current limiting resistor to the DC-DC converter, so if the DC-DC converter ever goes bad R73 will burn out.
 
Last edited:

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top